WordPress help

I’ve got custom archive page (code below) setup on my site. The problem is, for some reason, it only shows 5 posts per category (which you can see under the "Front Axle" category). All 6 posts show up and when I remove one of the posts that are displayed from that category, the missing post shows up.

I just don’t see anything in here that would be limiting the number of posts returned. Anybody know what the deal is?